No matter how well things are going for her or how zen she may want to be now that she's pregnant,Teen Mom Jenelle Evans just can't seem to simmer down ... Looks like she's been taking out her aggressions on baby daddy NathanGriffith's ex Brianna Dorris, via Twitter again.

This morning, Jenelle tweeted, "Hahaha stupid girl, thirstiest you have ever been ... Here's some water," and went on to tweet, "'In a relationship' means back the f—k off" and "Stay faithful or stay single." Lovely. After a Twitter confrontation she and Brianna had only a couple weeks back, and rumors swirling that Nathan may be making a play to get back with Brianna, this social media sparring is clearly just more of the same. In other words, a total waste of time.

More times than not, I feel like going after your S.O.'s ex is a misguided move. Just like more often than not, it's ludicrous for "the other woman" to be painted as the sole villain. This misogynistic idea of one woman stealing a man out from under another has got to go.

We're not one another's enemies ... Men obviously have something to do with it, too. After all, hello, does it not take two people to cheat?! Insecurities about a relationship need to be dealt with and discussed with your partner ... not the woman you suspect they're straying with.

Perhaps Jenelle and Nathan are talking it out one-on-one. For the sake of their baby on the way, let's hope they are. And if they really want to make it work, they've gotta zero in on their own issues and leave the past out of the picture.